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Post engine swap woes
Posted: Sat Nov 10, 2007 3:48 pm
by shaprid
Just swaped out M20B20 for M20B25 changed gearbox and all required bits, what a difference in driving car feels alive now not strangled, but after first start didn't want to tickover that has now cleared and ticks over at an indicated 500rpm and now it hunts revs don't change just the sound and smells a bit rich. I have done a search and it has been mentioned that the brain has to relearn its settings after being disconnected, so after all that waffle the question is should i live with it for a few days to see what settles or start tinkering. Ta
Re: Post engine swap woes
Posted: Sat Nov 10, 2007 3:51 pm
by Chris-W
Yes.
Re: Post engine swap woes
Posted: Sat Nov 10, 2007 4:36 pm
by shaprid
Thank you but Yes to which bit
Re: Post engine swap woes
Posted: Sat Nov 10, 2007 6:37 pm
by dannyboy759
Leave it for a few days, then go from there.
Re: Post engine swap woes
Posted: Sat Nov 10, 2007 7:07 pm
by Templ8e30
You did change the ECU for a 325i unit yes ?
Was the 325i engine running ok in the donor car ?
The ECU can take several warm-up cycles to settle in to a steady idle.
Cheers,
Iain T
Re: Post engine swap woes
Posted: Sun Nov 11, 2007 5:30 pm
by shaprid
Ok couldn't resist had a tinker checked out injector loom plug thats ok both sides, checked temp senders ok,started to clutch at straws leant on AFM and it stopped hunting inspection revealed big split in hose, temp repair to last until morning car now ticks over steady at indicated 750rpm, then engine takes on life of its own revs up three times in quick sucession settles then does it again and settles once more , I really hope thats normal anybody else had this?